Observer design error when the desire poles are equals ?

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Mohammed kandeel
Mohammed kandeel 2018-5-12
编辑： Ngoc Thanh Hung Bui 2018-5-13
I try to design full order observer with the following
G = [0 20.6; 1 0];
C = [0 1];
obsv_poles = [-10; -10];
ke = place(G',C',obsv_poles);
eig(G-ke'*C);
but i have the following error
Error using place (line 78) The "place" command cannot place poles with multiplicity greater than rank(B).

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